- historyhit.com locations/the-washington-monument/The Washington Monument was designed by architect Robert Mills, and is made out of marble, granite, and sandstone.
- ihitthebutton.com washington-monument-facts/Ever since I went to the top of the Washington Monument for its reopening I learned quite a bit about the history of this National landmark.
- thedistrict.com sightseeing/monuments-memorials-…Although it is now the most iconic landmark in Washington, D.C., the Washington Monument sat unfinished for an astonishingly long time.
- factsking.com important-places-facts/washington-…Adding to its height is the pyramidion, which measures 55 feet. It has particularly thin walls measuring a mere 7 inches, a fun Washington Monument fact.
- buyoya.com washington-monument-washington-d-c/Due to vandalism and safety concerns, the stairs have been closed since 1976. The cap at the tip of the Washington Monument is made of aluminum.
- earthcam.com usa/dc/washingtonmonument/…Thanks to EarthCam's partnership with the National Park Service, anyone can experience Washington, D.C., from the top of the Monument.
- frommers.com destinations/washington-d-c/…At this height, it’s clear to see that the Washington Monument lies at the very heart of Washington, D.C. landmarks. Its 360-degree views are spectacular.
- dcphotoguide.com washington-monument/Photos of the Washington Monument
- Washington Monument Before Dawn Reflected on the Tidal Basin
- Washington Monument at dusk against golden glow of sunset
- constitutioncenter.org blog/10-fascinating-facts-…In 1833, the Washington National Monument Society, a private organization, was among early groups promoting the idea for the tribute to the first President.
- associationforpublicart.org artwork/washington-…Funds for the monument accumulated slowly, and in 1824 a second Washington Monument Fund was formed by a group of citizens.